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  centos7下卸载自带的java安装jdk8
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  <h2 id="使用rpm命令查看系统已经安装的java"><a href="#使用rpm命令查看系统已经安装的java" class="headerlink" title="使用rpm命令查看系统已经安装的java"></a>使用rpm命令查看系统已经安装的java</h2><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">rpm -qa | grep java</span><br><span class="line">或者</span><br><span class="line">yum list installed | grep java   &#x2F;&#x2F;列举匹配已安装的java的软件包</span><br></pre></td></tr></table></figure>

<p>得到结果</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">java-1.8.0-openjdk-headless-1.8.0.101-3.b13.el7_2.x86_64</span><br><span class="line">javapackages-tools-3.4.1-11.el7.noarch</span><br><span class="line">tzdata-java-2016f-1.el7.noarch</span><br><span class="line">java-1.8.0-openjdk-1.8.0.101-3.b13.el7_2.x86_64</span><br><span class="line">Python-javapackages-3.4.1-11.el7.noarch</span><br></pre></td></tr></table></figure>
<a id="more"></a>
<h2 id="使用rpm命令删除已安装的java依赖"><a href="#使用rpm命令删除已安装的java依赖" class="headerlink" title="使用rpm命令删除已安装的java依赖"></a>使用rpm命令删除已安装的java依赖</h2><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">rpm -e --nodeps Java-1.8.0-openjdk-1.8.0.101-3.b13.el7_2.x86_64</span><br><span class="line">rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.101-3.b13.el7_2.x86_64</span><br><span class="line">或者</span><br><span class="line">yum -y remove java-1.8.0-openjdk*</span><br></pre></td></tr></table></figure>

<h2 id="再次检查java相关依赖"><a href="#再次检查java相关依赖" class="headerlink" title="再次检查java相关依赖"></a>再次检查java相关依赖</h2><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">rpm -qa | grep java</span><br><span class="line">java -version</span><br></pre></td></tr></table></figure>

<h2 id="安装JDK-介绍三种方法"><a href="#安装JDK-介绍三种方法" class="headerlink" title="安装JDK(介绍三种方法)"></a>安装JDK(介绍三种方法)</h2><h3 id="利用yum源来安装jdk（此方法不需要配置环境变量）"><a href="#利用yum源来安装jdk（此方法不需要配置环境变量）" class="headerlink" title="利用yum源来安装jdk（此方法不需要配置环境变量）"></a>利用yum源来安装jdk（此方法不需要配置环境变量）</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">yum -y install java-1.8.0-openjdk*</span><br></pre></td></tr></table></figure>
<blockquote>
<p>安装完之后，默认的安装目录是在: /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.151-1.b12.el7_4.x86_64</p>
</blockquote>
<h3 id="用rpm安装jdk-可以使用man-rpm命令查看rpm的帮助文档"><a href="#用rpm安装jdk-可以使用man-rpm命令查看rpm的帮助文档" class="headerlink" title="用rpm安装jdk(可以使用man rpm命令查看rpm的帮助文档)"></a>用rpm安装jdk(可以使用man rpm命令查看rpm的帮助文档)</h3><p>使用Xftp将下载好的jdk-8u152-linux-x64.rpm上传到CentOs上去</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">rpm -ivh jdk-8u152-linux-x64.rpm</span><br></pre></td></tr></table></figure>
<blockquote>
<p>默认安装在/usr/java目录下，不用配置环境变量</p>
</blockquote>
<h3 id="手动解压JDK的压缩包，然后设置环境变量"><a href="#手动解压JDK的压缩包，然后设置环境变量" class="headerlink" title="手动解压JDK的压缩包，然后设置环境变量"></a>手动解压JDK的压缩包，然后设置环境变量</h3><p>先将之前使用rpm方式安装的jdk卸载掉(如果没有安装过可跳过此步骤)<br>查询之前安装的jdk名称：rpm -qa | grep jdk<br>卸载jdk：rpm -e –nodeps jdk1.8    (此处也可以使用全名jdk1.8-1.8.0_152-fcs.x86_64)</p>
<p>将jdk1.8.0_152.tar.gz上传到服务器<br>解压缩包到/usr/java中</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">tar  -zxvf jdk1.8.0_152.tar.gz -C &#x2F;usr&#x2F;java</span><br></pre></td></tr></table></figure>

<p>设置环境变量</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">vim &#x2F;etc&#x2F;profile</span><br></pre></td></tr></table></figure>

<blockquote>
<p>注：进入profile 之后按 i 键进行编辑，Esc 键进入命令模式输出 :wq! 保存并退出</p>
</blockquote>
<p>写入以下配置</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">#set java environment</span><br><span class="line">JAVA_HOME&#x3D;&#x2F;usr&#x2F;java&#x2F;jdk1.8.0_152</span><br><span class="line">JRE_HOME&#x3D;$JAVA_HOME&#x2F;jre</span><br><span class="line">PATH&#x3D;$PATH:$JAVA_HOME&#x2F;bin:$JRE_HOME&#x2F;bin</span><br><span class="line">CLASSPATH&#x3D;.:$JAVA_HOME&#x2F;lib&#x2F;dt.jar:$JAVA_HOME&#x2F;lib&#x2F;tools.jar:$JRE_HOME&#x2F;lib</span><br><span class="line">export JAVA_HOME JRE_HOME PATH CLASSPATH</span><br></pre></td></tr></table></figure>
<blockquote>
<p>注释：<br>JAVA_HOME指明JDK安装路径，就是刚才安装时所选择的路径，此路径下包括lib，bin，jre等文件夹（tomcat，Eclipse的运行都需要依靠此变量）。<br>CLASSPATH为java加载类(class or lib)路径，只有类在classpath中，java命令才能识别，设：.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib。CLASSPATH变量值中的.表示当前目录<br>PATH使得系统可以在任何路径下识别java命令，设为：$JAVA_HOME/bin:$JRE_HOME/bin。<br>特别注意：环境变量值的结尾没有任何符号，不同值之间用:隔开（windows中用;）</p>
</blockquote>
<p>执行下面命令让profile生效</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">source &#x2F;etc&#x2F;profile</span><br></pre></td></tr></table></figure>

<p>检查是否安装成功</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">java -version</span><br></pre></td></tr></table></figure>

<blockquote>
<p>注：如果出现jdk版本信息便表示成功</p>
</blockquote>
 
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